diff --git a/src/api/admin.py b/src/api/admin.py
index a57e682..6a70764 100644
--- a/src/api/admin.py
+++ b/src/api/admin.py
@@ -723,11 +723,13 @@ async def update_cache_timeout(
 ):
     """Update cache timeout"""
     try:
-        if request.timeout < 60:
-            raise HTTPException(status_code=400, detail="Cache timeout must be at least 60 seconds")
+        # Allow -1 for never delete, otherwise must be between 60-86400
+        if request.timeout != -1:
+            if request.timeout < 60:
+                raise HTTPException(status_code=400, detail="Cache timeout must be at least 60 seconds or -1 for never delete")
 
-        if request.timeout > 86400:
-            raise HTTPException(status_code=400, detail="Cache timeout cannot exceed 24 hours (86400 seconds)")
+            if request.timeout > 86400:
+                raise HTTPException(status_code=400, detail="Cache timeout cannot exceed 24 hours (86400 seconds)")
 
         # Update in-memory config
         config.set_cache_timeout(request.timeout)
@@ -739,9 +741,10 @@ async def update_cache_timeout(
         if generation_handler:
             generation_handler.file_cache.set_timeout(request.timeout)
 
+        timeout_msg = "never delete" if request.timeout == -1 else f"{request.timeout} seconds"
         return {
             "success": True,
-            "message": f"Cache timeout updated to {request.timeout} seconds",
+            "message": f"Cache timeout updated to {timeout_msg}",
             "timeout": request.timeout
         }
     except HTTPException:
diff --git a/src/main.py b/src/main.py
index 222d6aa..6bb62c0 100644
--- a/src/main.py
+++ b/src/main.py
@@ -120,6 +120,9 @@ async def startup_event():
     config.set_cache_enabled(cache_config.cache_enabled)
     config.set_cache_timeout(cache_config.cache_timeout)
     config.set_cache_base_url(cache_config.cache_base_url or "")
+    
+    # Sync cache timeout to file cache instance
+    generation_handler.file_cache.set_timeout(cache_config.cache_timeout)
 
     # Load generation configuration from database
     generation_config = await db.get_generation_config()
diff --git a/src/services/file_cache.py b/src/services/file_cache.py
index edeb100..ea56fa4 100644
--- a/src/services/file_cache.py
+++ b/src/services/file_cache.py
@@ -62,6 +62,10 @@ class FileCache:
     async def _cleanup_expired_files(self):
         """Remove expired cache files"""
         try:
+            # Skip cleanup if timeout is -1 (never delete)
+            if self.default_timeout == -1:
+                return
+            
             current_time = time.time()
             removed_count = 0
             
diff --git a/static/manage.html b/static/manage.html
index 1f61ffc..88ec4e8 100644
--- a/static/manage.html
+++ b/static/manage.html
@@ -242,8 +242,8 @@
                         <div id="cacheOptions" style="display: none;" class="space-y-4 pt-4 border-t border-border">
                             <div>
                                 <label class="text-sm font-medium mb-2 block">缓存超时时间（秒）</label>
-                                <input id="cfgCacheTimeout" type="number" class="flex h-9 w-full rounded-md border border-input bg-background px-3 py-2 text-sm" placeholder="7200" min="60" max="86400">
-                                <p class="text-xs text-muted-foreground mt-1">文件缓存超时时间，范围：60-86400 秒（1分钟-24小时）</p>
+                                <input id="cfgCacheTimeout" type="number" class="flex h-9 w-full rounded-md border border-input bg-background px-3 py-2 text-sm" placeholder="7200" min="-1" max="86400">
+                                <p class="text-xs text-muted-foreground mt-1">文件缓存超时时间，范围：60-86400 秒（1分钟-24小时），-1 表示永不自动删除</p>
                             </div>
                             <div>
                                 <label class="text-sm font-medium mb-2 block">缓存文件访问域名</label>
@@ -716,7 +716,7 @@
         toggleCacheOptions=()=>{const enabled=$('cfgCacheEnabled').checked;$('cacheOptions').style.display=enabled?'block':'none'},
         loadCacheConfig=async()=>{try{console.log('开始加载缓存配置...');const r=await apiRequest('/api/cache/config');if(!r){console.error('API请求失败');return}const d=await r.json();console.log('缓存配置数据:',d);if(d.success&&d.config){const enabled=d.config.enabled!==false;const timeout=d.config.timeout||7200;const baseUrl=d.config.base_url||'';const effectiveUrl=d.config.effective_base_url||'';console.log('设置缓存启用:',enabled);console.log('设置超时时间:',timeout);console.log('设置域名:',baseUrl);console.log('生效URL:',effectiveUrl);$('cfgCacheEnabled').checked=enabled;$('cfgCacheTimeout').value=timeout;$('cfgCacheBaseUrl').value=baseUrl;if(effectiveUrl){$('cacheEffectiveUrlValue').textContent=effectiveUrl;$('cacheEffectiveUrl').classList.remove('hidden')}else{$('cacheEffectiveUrl').classList.add('hidden')}toggleCacheOptions();console.log('缓存配置加载成功')}else{console.error('缓存配置数据格式错误:',d)}}catch(e){console.error('加载缓存配置失败:',e);showToast('加载缓存配置失败: '+e.message,'error')}},
         loadGenerationTimeout=async()=>{try{console.log('开始加载生成超时配置...');const r=await apiRequest('/api/generation/timeout');if(!r){console.error('API请求失败');return}const d=await r.json();console.log('生成超时配置数据:',d);if(d.success&&d.config){const imageTimeout=d.config.image_timeout||300;const videoTimeout=d.config.video_timeout||1500;console.log('设置图片超时:',imageTimeout);console.log('设置视频超时:',videoTimeout);$('cfgImageTimeout').value=imageTimeout;$('cfgVideoTimeout').value=videoTimeout;console.log('生成超时配置加载成功')}else{console.error('生成超时配置数据格式错误:',d)}}catch(e){console.error('加载生成超时配置失败:',e);showToast('加载生成超时配置失败: '+e.message,'error')}},
-        saveCacheConfig=async()=>{const enabled=$('cfgCacheEnabled').checked,timeout=parseInt($('cfgCacheTimeout').value)||7200,baseUrl=$('cfgCacheBaseUrl').value.trim();console.log('保存缓存配置:',{enabled,timeout,baseUrl});if(timeout<60||timeout>86400)return showToast('缓存超时时间必须在 60-86400 秒之间','error');if(baseUrl&&!baseUrl.startsWith('http://')&&!baseUrl.startsWith('https://'))return showToast('域名必须以 http:// 或 https:// 开头','error');try{console.log('保存缓存启用状态...');const r0=await apiRequest('/api/cache/enabled',{method:'POST',body:JSON.stringify({enabled:enabled})});if(!r0){console.error('保存缓存启用状态请求失败');return}const d0=await r0.json();console.log('缓存启用状态保存结果:',d0);if(!d0.success){console.error('保存缓存启用状态失败:',d0);return showToast('保存缓存启用状态失败','error')}console.log('保存超时时间...');const r1=await apiRequest('/api/cache/config',{method:'POST',body:JSON.stringify({timeout:timeout})});if(!r1){console.error('保存超时时间请求失败');return}const d1=await r1.json();console.log('超时时间保存结果:',d1);if(!d1.success){console.error('保存超时时间失败:',d1);return showToast('保存超时时间失败','error')}console.log('保存域名...');const r2=await apiRequest('/api/cache/base-url',{method:'POST',body:JSON.stringify({base_url:baseUrl})});if(!r2){console.error('保存域名请求失败');return}const d2=await r2.json();console.log('域名保存结果:',d2);if(d2.success){showToast('缓存配置保存成功','success');console.log('等待配置文件写入完成...');await new Promise(r=>setTimeout(r,200));console.log('重新加载配置...');await loadCacheConfig()}else{console.error('保存域名失败:',d2);showToast('保存域名失败','error')}}catch(e){console.error('保存失败:',e);showToast('保存失败: '+e.message,'error')}},
+        saveCacheConfig=async()=>{const enabled=$('cfgCacheEnabled').checked,timeout=parseInt($('cfgCacheTimeout').value)||7200,baseUrl=$('cfgCacheBaseUrl').value.trim();console.log('保存缓存配置:',{enabled,timeout,baseUrl});if(timeout!==-1&&(timeout<60||timeout>86400))return showToast('缓存超时时间必须在 60-86400 秒之间，或 -1 表示永不删除','error');if(baseUrl&&!baseUrl.startsWith('http://')&&!baseUrl.startsWith('https://'))return showToast('域名必须以 http:// 或 https:// 开头','error');try{console.log('保存缓存启用状态...');const r0=await apiRequest('/api/cache/enabled',{method:'POST',body:JSON.stringify({enabled:enabled})});if(!r0){console.error('保存缓存启用状态请求失败');return}const d0=await r0.json();console.log('缓存启用状态保存结果:',d0);if(!d0.success){console.error('保存缓存启用状态失败:',d0);return showToast('保存缓存启用状态失败','error')}console.log('保存超时时间...');const r1=await apiRequest('/api/cache/config',{method:'POST',body:JSON.stringify({timeout:timeout})});if(!r1){console.error('保存超时时间请求失败');return}const d1=await r1.json();console.log('超时时间保存结果:',d1);if(!d1.success){console.error('保存超时时间失败:',d1);return showToast('保存超时时间失败','error')}console.log('保存域名...');const r2=await apiRequest('/api/cache/base-url',{method:'POST',body:JSON.stringify({base_url:baseUrl})});if(!r2){console.error('保存域名请求失败');return}const d2=await r2.json();console.log('域名保存结果:',d2);if(d2.success){showToast('缓存配置保存成功','success');console.log('等待配置文件写入完成...');await new Promise(r=>setTimeout(r,200));console.log('重新加载配置...');await loadCacheConfig()}else{console.error('保存域名失败:',d2);showToast('保存域名失败','error')}}catch(e){console.error('保存失败:',e);showToast('保存失败: '+e.message,'error')}},
         saveGenerationTimeout=async()=>{const imageTimeout=parseInt($('cfgImageTimeout').value)||300,videoTimeout=parseInt($('cfgVideoTimeout').value)||1500;console.log('保存生成超时配置:',{imageTimeout,videoTimeout});if(imageTimeout<60||imageTimeout>3600)return showToast('图片超时时间必须在 60-3600 秒之间','error');if(videoTimeout<60||videoTimeout>7200)return showToast('视频超时时间必须在 60-7200 秒之间','error');try{const r=await apiRequest('/api/generation/timeout',{method:'POST',body:JSON.stringify({image_timeout:imageTimeout,video_timeout:videoTimeout})});if(!r){console.error('保存请求失败');return}const d=await r.json();console.log('保存结果:',d);if(d.success){showToast('生成超时配置保存成功','success');await new Promise(r=>setTimeout(r,200));await loadGenerationTimeout()}else{console.error('保存失败:',d);showToast('保存失败','error')}}catch(e){console.error('保存失败:',e);showToast('保存失败: '+e.message,'error')}},
         toggleATAutoRefresh=async()=>{try{const enabled=$('atAutoRefreshToggle').checked;const r=await apiRequest('/api/token-refresh/enabled',{method:'POST',body:JSON.stringify({enabled:enabled})});if(!r){$('atAutoRefreshToggle').checked=!enabled;return}const d=await r.json();if(d.success){showToast(enabled?'AT自动刷新已启用':'AT自动刷新已禁用','success')}else{showToast('操作失败: '+(d.detail||'未知错误'),'error');$('atAutoRefreshToggle').checked=!enabled}}catch(e){showToast('操作失败: '+e.message,'error');$('atAutoRefreshToggle').checked=!enabled}},
         loadATAutoRefreshConfig=async()=>{try{const r=await apiRequest('/api/token-refresh/config');if(!r)return;const d=await r.json();if(d.success&&d.config){$('atAutoRefreshToggle').checked=d.config.at_auto_refresh_enabled||false}else{console.error('AT自动刷新配置数据格式错误:',d)}}catch(e){console.error('加载AT自动刷新配置失败:',e)}},